White Paper
J300
12
July 2005
Entertainment
Media player
The media player supports different audio formats
and the H.263 video format. Streaming, download
and playback are all supported.
Music
The media player is a multi-format digital audio
player which enables the user to carry and play a
selection of favourite songs. A range of audio for-
mats are supported:
•
AAC mono
Advanced Audio Coding. AAC is the latest
audio coding standard and it is used for high-
quality audio compression. This product sup-
ports AAC mono only. AAC provides higher
quality than MP3 at the same bit rate, or for the
same audio quality it uses a 30 percent lower bit
rate. It supports the coding of multichannel
audio, with up to 48 main channels and 16 low-
frequency channels. AAC has a profile for Low
Complexity (LC) to facilitate trade off between
quality, memory and processing power require-
ments.
•
AMR
Adaptive Multi Rate. A medium quality com-
pressed sound format.
•
MP3
MP3 is the file extension for MPEG audio layer
3. Layer 3 is one of three coding schemes (layer
1, layer 2 and layer 3) for the compression of
audio signals. Layer 3 uses a very efficient com-
pression method, removing all irrelevant parts of
a sound signal that the human ear cannot per-
ceive. The result is, for example, CD digital
audio (CDDA) converted to MP3 with almost
untouched quality, compressed by a factor of
around 12. The high compression of audio in
MP3 files makes them relatively small, though
MP3 files can be created with different size and
quality compromises. The small file size,
together with the excellent sound quality, are
the main reasons for the MP3-format’s massive
popularity when sharing music over the Internet.
•
WAV
A wave file is identified by a file name extension
of WAV (.wav). Used primarily in PCs, the wave
file format has been accepted as a viable inter-
change medium for other computer platforms,
such as Macintosh. This allows content devel-
opers to freely move audio files between plat-
forms for processing, for example.
In addition to the uncompressed raw audio
data, the wave file format stores information
about the file's number of tracks (mono or
stereo), sample rate, and bit depth.
Songs may be stored in the File manager. The
folder system enables the user to organize songs
into groups.
Songs may be collected in numerous ways, includ-
ing Internet download and file transfer from a PC.
The media player is intelligently aware of other
applications in the phone:
•
Playback is paused when a telephone call is
made or received.
•
Playback is paused if the user starts another
application which requires the audio channels to
be dedicated to it.
The Media player supports download and playback
of H.263 formats for viewing video clips in the
phone.
Streaming support
The media player can be launched from hyperlinks
in the WAP browser, SDP files in the file manager or
in messages through hyperlinks. Content is
streamed using RTSP (Real Time Streaming Proto-
col) session control.
